[Pidgin] #16805: Add IdenTrust to trusted certificates on Windows

[Pidgin]

#16805: Add IdenTrust to trusted certificates on Windows
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 Reporter:  Kromey   |      Owner:  EionRobb
     Type:  defect   |     Status:  new
Milestone:           |  Component:  unclassified
  Version:  2.10.11  |   Keywords:
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 The !IdenTrust DST Root CA X3 certificate is currently being used to
 cross-sign certificates issued by Let's Encrypt
 (https://letsencrypt.org/certificates/). While this is trusted in all
 browsers across all OSes that I have tested, and is trusted in Pidgin (at
 least on Ubuntu 12.04 LTS), it is ''not'' currently trusted in Pidgin on
 Windows.

 The !IdenTrust certificate is available here:
 https://www.identrust.com/certificates/trustid/root-download-x3.html

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Ticket URL: <https://developer.pidgin.im/ticket/16805>
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